package com.huanxiao.base.view;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;

import com.huanxiao.base.R;

/**
 * Created by luoliuqing on 16/11/14.
 */
public class GifView  extends View {

	private static final int DEFAULT_MOVIE_VIEW_DURATION = 1000;

	private int mMovieResourceId;
	private Movie movie;

	private long mMovieStart;
	private int mCurrentAnimationTime;


	/**
	 * Position for drawing animation frames in the center of the view.
	 */
	private float mLeft;
	private float mTop;

	/**
	 * Scaling factor to fit the animation within view bounds.
	 */
	private float mScale;

	/**
	 * Scaled movie frames width and height.
	 */
	private int mMeasuredMovieWidth;
	private int mMeasuredMovieHeight;

	private volatile boolean mPaused;
	private boolean mIsLoop = true;
	private boolean mVisible = true;

	private IGifLoadFinishListener mIGifLoadFinishListener;

	public interface IGifLoadFinishListener{
		public void isLoadFinish();
	}

	public GifView(Context context) {
		this(context, null);
	}

	public GifView(Context context, AttributeSet attrs) {
		this(context, attrs, R.styleable.CustomTheme_gifViewStyle);
	}

	public GifView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);

		setViewAttributes(context, attrs, defStyle);
	}

	@SuppressLint("NewApi")
	private void setViewAttributes(Context context, AttributeSet attrs, int defStyle) {

		/**
		 * Starting from HONEYCOMB(Api Level:11) have to turn off HW acceleration to draw
		 * Movie on Canvas.
		 */
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
			setLayerType(View.LAYER_TYPE_SOFTWARE, null);
		}

		final TypedArray array = context.obtainStyledAttributes(attrs,
				R.styleable.GifView, defStyle, R.style.Widget_GifView);

		//-1 is default value
		mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1);
		mPaused = array.getBoolean(R.styleable.GifView_paused, false);
		mIsLoop = array.getBoolean(R.styleable.GifView_isLoop, true);
		array.recycle();

		if (mMovieResourceId != -1) {
			movie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
		}
	}

	public void setGifResource(int movieResourceId) {
		this.mMovieResourceId = movieResourceId;
		movie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
		mMovieStart = android.os.SystemClock.uptimeMillis();
		requestLayout();
	}

	public void setGifResource(String path) {
		movie =   Movie.decodeFile(path);
		mMovieStart = android.os.SystemClock.uptimeMillis();
		requestLayout();
	}

	public int getGifResource() {

		return this.mMovieResourceId;
	}


	public void play() {
		if (this.mPaused) {
			this.mPaused = false;

			/**
			 * Calculate new movie start time, so that it resumes from the same
			 * frame.
			 */
			mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime;

			invalidate();
		}
	}

	public void pause() {
		if (!this.mPaused) {
			this.mPaused = true;

			invalidate();
		}

	}


	public boolean isPaused() {
		return this.mPaused;
	}

	public boolean isPlaying() {
		return !this.mPaused;
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		if (movie != null) {
			int movieWidth = movie.width();
			int movieHeight = movie.height();
			/*
             * Calculate horizontal scaling
			 */
			float scaleH = 1f;
			int measureModeWidth = MeasureSpec.getMode(widthMeasureSpec);

			if (measureModeWidth != MeasureSpec.UNSPECIFIED) {
				int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);
				if (movieWidth > maximumWidth) {
					scaleH = (float) movieWidth / (float) maximumWidth;
				}else {
					scaleH = (float) movieWidth / maximumWidth;
				}
			}

			/*
             * calculate vertical scaling
			 */
			float scaleW = 1f;
			int measureModeHeight = MeasureSpec.getMode(heightMeasureSpec);

			if (measureModeHeight != MeasureSpec.UNSPECIFIED) {
				int maximumHeight = MeasureSpec.getSize(heightMeasureSpec);
				if (movieHeight > maximumHeight) {//gif 帧图片高度比空间要大
					scaleW = (float) movieHeight / (float) maximumHeight;
				}else {//gif 帧图片高度比空间要小
					scaleW = (float) movieHeight / (float) maximumHeight;
				}
			}

			/*
             * calculate overall scale
			 */
			mScale = 1f / Math.max(scaleH, scaleW);

			mMeasuredMovieWidth = (int) (movieWidth * mScale);
			mMeasuredMovieHeight = (int) (movieHeight * mScale);

			setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);

		} else {
			/*
			 * No movie set, just set minimum available size.
			 */
			setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight());
		}
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		super.onLayout(changed, l, t, r, b);
		/*
		 * Calculate mLeft / mTop for drawing in center
		 */
		mLeft = (getWidth() - mMeasuredMovieWidth) / 2f;
		mTop = (getHeight() - mMeasuredMovieHeight) / 2f;

		mVisible = getVisibility() == View.VISIBLE;
	}

	@Override
	protected void onDraw(Canvas canvas) {
		if (movie != null) {
			if (!mPaused) {
				updateAnimationTime();
				if (mIsLoop == false && isFinish()) {
					mCurrentAnimationTime  = movie.duration();
					drawMovieFrame(canvas);
					if (mIGifLoadFinishListener != null){
						mIGifLoadFinishListener.isLoadFinish();
					}
					return;
				}
				drawMovieFrame(canvas);
				invalidateView();
			} else {
				drawMovieFrame(canvas);
			}
		}
	}

	/**
	 * Invalidates view only if it is mVisible.
	 * <br>
	 * {@link #postInvalidateOnAnimation()} is used for Jelly Bean and higher.
	 */
	@SuppressLint("NewApi")
	private void invalidateView() {
		if (mVisible) {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
				postInvalidateOnAnimation();
			} else {
				invalidate();
			}
		}
	}

	/**
	 * Calculate current animation time
	 */
	private void updateAnimationTime() {
		long now = android.os.SystemClock.uptimeMillis();

		if (mMovieStart == 0) {
			mMovieStart = now;
		}

		int dur = movie.duration();

		if (dur == 0) {
			dur = DEFAULT_MOVIE_VIEW_DURATION;
		}

		mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
	}

	/**
	 * Draw current GIF frame
	 */
	private void drawMovieFrame(Canvas canvas) {
		movie.setTime(mCurrentAnimationTime);
		canvas.save(Canvas.MATRIX_SAVE_FLAG);
		canvas.scale(mScale, mScale);
		movie.draw(canvas, mLeft / mScale, mTop / mScale);
		canvas.restore();
	}

	@SuppressLint("NewApi")
	@Override
	public void onScreenStateChanged(int screenState) {
		super.onScreenStateChanged(screenState);
		mVisible = screenState == SCREEN_STATE_ON;
		invalidateView();
	}

	@SuppressLint("NewApi")
	@Override
	protected void onVisibilityChanged(View changedView, int visibility) {
		super.onVisibilityChanged(changedView, visibility);
		mVisible = visibility == View.VISIBLE;
		invalidateView();
	}

	@Override
	protected void onWindowVisibilityChanged(int visibility) {
		super.onWindowVisibilityChanged(visibility);
		mVisible = visibility == View.VISIBLE;
		invalidateView();
	}

	public void setmIGifLoadFinishListener(IGifLoadFinishListener mIGifLoadFinishListener) {
		this.mIGifLoadFinishListener = mIGifLoadFinishListener;
	}

	/**
	 * 判断是否播放到zuihou
	 */
	private boolean isFinish(){
		long now = android.os.SystemClock.uptimeMillis();
		return now- mMovieStart >=movie.duration();
	}
}